Ok, so here's my story on 2.6.25-rc2-mm1:

Built fine on my Pentium D in 32 bit mode, booted too, although
complaining once already while unpacking the initramfs:

<0>[    0.069176] BUG: spinlock bad magic on CPU#0, swapper/0
<0>[    0.069324]  lock: c2c19480, .magic: 00000000, .owner: swapper/0, .owner_cpu: 0
<4>[    0.069559] Pid: 0, comm: swapper Not tainted 2.6.25-rc2-mm1-testing #1
<4>[    0.069710]  [spin_bug+129/140] spin_bug+0x81/0x8c
<4>[    0.069907]  [_raw_spin_unlock+30/118] _raw_spin_unlock+0x1e/0x76
<4>[    0.069997]  [_spin_unlock+34/65] _spin_unlock+0x22/0x41
<4>[    0.070194]  [mnt_want_write+103/138] mnt_want_write+0x67/0x8a
<4>[    0.070390]  [sys_mkdirat+139/219] sys_mkdirat+0x8b/0xdb
<4>[    0.070584]  [clean_path+27/79] ? clean_path+0x1b/0x4f
<4>[    0.070829]  [trace_hardirqs_on+11/13] ? trace_hardirqs_on+0xb/0xd
<4>[    0.071185]  [sys_mkdir+21/23] sys_mkdir+0x15/0x17
<4>[    0.071378]  [do_name+279/440] do_name+0x117/0x1b8
<4>[    0.071570]  [write_buffer+34/49] write_buffer+0x22/0x31
<4>[    0.071763]  [flush_window+105/184] flush_window+0x69/0xb8
<4>[    0.071996]  [unpack_to_rootfs+1585/2238] unpack_to_rootfs+0x631/0x8be
<4>[    0.072192]  [trace_hardirqs_on_caller+248/301] ? trace_hardirqs_on_caller+0xf8/0x12d
<4>[    0.072440]  [restore_nocheck_notrace+0/16] ? restore_nocheck_notrace+0x0/0x10
<4>[    0.072689]  [populate_rootfs+37/270] populate_rootfs+0x25/0x10e
<4>[    0.072886]  [alternative_instructions+344/349] ? alternative_instructions+0x158/0x15d
<4>[    0.073139]  [start_kernel+840/858] start_kernel+0x348/0x35a
<4>[    0.073335]  =======================

Still, X came up fine, I could log in (Gnome feeling subjectively
a bit sluggish), call up a web page from the Internet in Firefox,
and start perusing the logs, when the whole system froze: neither
mouse nor keyboard would react anymore, and only the Wind^Wreset
button would put me back in control. After rebooting into the
previous, non-mm kernel I found this in the syslog:

Feb 20 17:22:40 xenon kernel: [   48.180297] BUG: using smp_processor_id() in preemptible [00000000] code: ntpdate/3562
Feb 20 17:22:40 xenon kernel: [   48.180297] caller is __nf_conntrack_find+0x9b/0xeb [nf_conntrack]
Feb 20 17:22:40 xenon kernel: [   48.180297] Pid: 3562, comm: ntpdate Not tainted 2.6.25-rc2-mm1-testing #1
Feb 20 17:22:40 xenon kernel: [   48.180297]  [<c02015b9>] debug_smp_processor_id+0x99/0xb0
Feb 20 17:22:40 xenon kernel: [   48.180297]  [<fac643a7>] __nf_conntrack_find+0x9b/0xeb [nf_conntrack]
Feb 20 17:22:40 xenon kernel: [   48.180297]  [<fac64410>] nf_conntrack_find_get+0x19/0x56 [nf_conntrack]
Feb 20 17:22:40 xenon kernel: [   48.180297]  [<fac65427>] nf_conntrack_in+0x149/0x42a [nf_conntrack]
Feb 20 17:22:40 xenon kernel: [   48.180297]  [<c0123f5a>] ? sub_preempt_count+0xa2/0xb0
Feb 20 17:22:40 xenon kernel: [   48.180297]  [<c0310541>] ? _spin_unlock_irqrestore+0x5b/0x71
Feb 20 17:22:40 xenon kernel: [   48.180297]  [<c0145a93>] ? trace_hardirqs_on+0xb/0xd
Feb 20 17:22:40 xenon kernel: [   48.180297]  [<c0144441>] ? trace_hardirqs_off+0xb/0xd
Feb 20 17:22:40 xenon kernel: [   48.180358]  [<fad011cc>] ipv4_conntrack_local+0x55/0x5e [nf_conntrack_ipv4]
Feb 20 17:22:40 xenon kernel: [   48.180387]  [<c02ba0ac>] nf_iterate+0x34/0x69
Feb 20 17:22:40 xenon kernel: [   48.180406]  [<c02c17a8>] ? dst_output+0x0/0x10
Feb 20 17:22:40 xenon kernel: [   48.180440]  [<c02ba182>] nf_hook_slow+0x45/0xa2
Feb 20 17:22:40 xenon kernel: [   48.180463]  [<c02c17a8>] ? dst_output+0x0/0x10
Feb 20 17:22:40 xenon kernel: [   48.180499]  [<c02c2ada>] __ip_local_out+0x8c/0x96
Feb 20 17:22:40 xenon kernel: [   48.180519]  [<c02c17a8>] ? dst_output+0x0/0x10
Feb 20 17:22:40 xenon kernel: [   48.180549]  [<c02c2af4>] ip_local_out+0x10/0x20
Feb 20 17:22:40 xenon kernel: [   48.180570]  [<c02c2d5d>] ip_push_pending_frames+0x259/0x2d8
Feb 20 17:22:40 xenon kernel: [   48.180606]  [<c02dbe61>] udp_push_pending_frames+0x2ba/0x328
Feb 20 17:22:40 xenon kernel: [   48.180653]  [<c02dcf9d>] udp_sendmsg+0x456/0x583
Feb 20 17:22:40 xenon kernel: [   48.180751]  [<c02e2799>] inet_sendmsg+0x40/0x4d
Feb 20 17:22:40 xenon kernel: [   48.180783]  [<c02993d5>] sock_sendmsg+0xe3/0xfe
Feb 20 17:22:40 xenon kernel: [   48.180840]  [<c013a405>] ? autoremove_wake_function+0x0/0x35
Feb 20 17:22:40 xenon kernel: [   48.180875]  [<c0167f40>] ? find_lock_page+0x81/0x8a
Feb 20 17:22:40 xenon kernel: [   48.180902]  [<c0166ab9>] ? trace_preempt_on+0x1e/0xaf
Feb 20 17:22:40 xenon kernel: [   48.180920]  [<c011b696>] ? kunmap_atomic+0x89/0xa3
Feb 20 17:22:40 xenon kernel: [   48.180945]  [<c017408c>] ? __do_fault+0x31d/0x378
Feb 20 17:22:40 xenon kernel: [   48.180974]  [<c0123f5a>] ? sub_preempt_count+0xa2/0xb0
Feb 20 17:22:40 xenon kernel: [   48.181001]  [<c011b696>] ? kunmap_atomic+0x89/0xa3
Feb 20 17:22:40 xenon kernel: [   48.181070]  [<c0299d3e>] sys_sendto+0xa9/0xc8
Feb 20 17:22:40 xenon kernel: [   48.181111]  [<c017615b>] ? handle_mm_fault+0x327/0x793
Feb 20 17:22:40 xenon kernel: [   48.181221]  [<c029a4ea>] sys_socketcall+0x100/0x183
Feb 20 17:22:40 xenon kernel: [   48.181269]  [<c0106d00>] sysenter_past_esp+0x6d/0xb9
Feb 20 17:22:40 xenon kernel: [   48.181341]  =======================

This BUG repeated thrice almost identically for ntpdate, and then with
increasing frequency for avahi-daemon, nmbd, smbd and firefox-bin, up
to the point where the system froze.

Looks Netfilter related, CCing netfilter and netdev lists.
Config attached.

HTH
T.

-- 
Tilman Schmidt                          E-Mail: tilman@imap.cc
Bonn, Germany
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